package jlookuptabledemo;import java.awt.*;import javax.swing.JPanel;import java.awt.image.*;public class DrawPane extends JPanel {  private BorderLayout borderLayout1 = new BorderLayout();  Image image;  BufferedImage bimage;  Graphics2D g2D;  LookupTable LUT;  public DrawPane() {    try {      jbInit();    }    catch(Exception ex) {      ex.printStackTrace();    }  }  void jbInit() throws Exception {    this.setLayout(borderLayout1);    loadImage();    createBufferedImage();    this.setSize(image.getWidth(this),image.getHeight(this));  }  public void loadImage(){    image = this.getToolkit().getImage("images/image.jpg");    MediaTracker mt = new MediaTracker(this);    mt.addImage(image,0);    try{      mt.waitForAll();    }catch(Exception err){      System.err.println("Could not load the image.");    }    if (image.getWidth(this) == -1){      System.err.println("Could not get the image.");      System.exit(1);    }  }  public void createBufferedImage(){    bimage = new BufferedImage(image.getWidth(this),image.getHeight(this),        BufferedImage.TYPE_INT_ARGB);    g2D = bimage.createGraphics();    g2D.drawImage(image,0,0,this);  }  public void brightenLUT(){    short[] brighten = new short[256];    short pixelValue;    for (int i=0;i<256;i++){      pixelValue = (short)(i+10);      if (pixelValue>255)        pixelValue = 255;      else if (pixelValue <0)        pixelValue =0;      brighten[i] = pixelValue;    }    LUT = new ShortLookupTable(0,brighten);  }  public void darkenLUT(){    short[] darken = new short[256];    short pixelValue;    for (int i=0;i<256;i++){      pixelValue = (short)(i-10);      if (pixelValue>255)        pixelValue = 255;      else if (pixelValue <0)        pixelValue =0;      darken[i] = pixelValue;    }    LUT = new ShortLookupTable(0,darken);  }  public void reset(){    g2D.setColor(Color.black);    g2D.clearRect(0,0,image.getWidth(this),image.getHeight(this));    g2D.drawImage(image,0,0,this);  }  public void applyFilter(){    LookupOp lop = new LookupOp(LUT,null);    lop.filter(bimage,bimage);  }  public void update(Graphics g){    g.clearRect(0,0,this.getWidth(),this.getHeight());    paintComponent(g);  }  public void paintComponent(Graphics g){    super.paintComponent(g);    Graphics2D g2 = (Graphics2D)g;    g2.drawImage(bimage,0,0,this);  }}